Abstract: Developing renewable generations is an important strategic measure for building a new energy system and helping China achieve the goal of "double-carbon". The decentralized mode of renewable generation has been widely adopted in China's central, eastern and southern regions due to its topographical characteristics. However, decentralized renewable generation is usually located in the area of weak grid structure with industrial load access. Due to its power electronic characteristics, complex stability control problems may arise after access to the grid. In this paper, we review the mechanism analysis and control methods of stability problems of decentralized renewable generations integrated into the grid. We conclude different types of stability problems in terms of harmonics, voltage, transient synchronization and frequency from the perspective of multiple time scales. Then the relevant standards of renewable energy integration to the grid in China are summarized. The reasons for complex grid-integrated stability problems are further analyzed. The principles, strengths, weaknesses and disadvantages of various stability control methods are elaborated and compared. Finally, we summarize the status quo of researches and put forward the prospects in the future research direction of this field by combining the development trend of new energy storage and artificial intelligence algorithms.